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(No Model.) 1 2 Sheets-Sheet 1. J. L; I-I ARKNESS & O. B. SHAW.

ROGK'DRILLING MACHINE.

No. 307,762. Patented Nov. 11, 1884.

Attorney! 04. PETERS mmmmn a lwr. Wishingtdn. u. c.

(No Model.) 2 Sheets-Sheet 2. J. L. HARKNESS & G. B. SHAW.

ROCK DRILLING MACHINE.

No. 307,762. Patented Nov. 11, 1884.

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C l l TI 11 A 'ESSZL'S llnirnn S'rarns Parent tOlrricm J OHN L. HARKNESS AND CHARLES E. SHAW, OF OSKALOOSA, IOW'A; SAID SHAXV ASSIGNOR TO SAID HABKNESS.

ROCK DRiLLlNG MACHENE.

EPECIFICATION forming part of Letters Patent No. 807,762,6lated November 11, 1884.

Application filed January 4, 1884. (No model.)

To ctZZ whom it may concern:

Be it known that WG,'JOHN L. HARKNESS and CHARLES E. Srmw, citizens of the United States, residing at ()skaloosa, in the county of Mahaska and State of Iowa, have invented a new and useful Rock-Drilling Machine, of which the following is a specification, refer ence being had to the accompanying drawings.

This invention relates to drilling-machines IO especially adapted for mining coal, and to be operated by means of a crank and it has for its object to provide means whereby the operating mechanism will be permitted to slide either forward or backward, so as to move as I 5 the anger is being forced inward, and slide backward to its former position, in order to operate the anger or drill anew. It also has for its object to provide for the return of the sliding operating mechanism to its original position without taking the trouble and time of reversing the operation of the crank and returning it in that slow and tedious manner; and a still further object of my invention provides for a support of the operating mechanism,

which will be adjustable in length, so as to ac commodate itself to the size of the coal-mine.

\Vith these objects in view, the said invention consists in certain details of construction and combination of parts as hereinafter set forth, and particularly pointed out in the claim.

In the accompanying drawings, Figure I is a perspective view of the drilling machine, showing its application. Fig. 2 is a longitudinal sectional View. Fig. 3 is a detail view of the parts of the handle. Fig. 4- is a transverse sectional view on the line a: m, Fig. 2. Fig. 5 is a transverse sectional view on the line 3/ y,

Fig. 2.

Like letters ofrcference indicate corresponding parts in the several figures.

Referring to the drawings, A designates the adjustable support of the drilling mechanism, consisting of two sections or parts,a a,connected by sliding plates 6 b at the inner ends of the sections, the plate I; of section a sliding over the section a, and plate I) of section a sliding over the section a, and thereby allowing the extension of the sections to the re- 5 quired length. A series of holes or openings,

c, are formed in the section a to receive split keys (l, by means of which the sections are held apart at any desired point. Pointed rods B 13 project from the outer ends of the sections of the support A, so as to engage with the top and bottom of the mine, the rod B at the lower end of the support screwing into the said end and being provided with an operating-bar, 0, passed through it, and by means of which said rod may be worked or turned down into the bottom of the mine to hold the support more securely.

The drilling mechanism is mounted upon a suitable base, D, having a track or plate, E, attached to its upper face, the rear or inner end of the base being provided with a U-- shaped extension, h, to clasp the sides of the support A, the base resting at its rear end upon one of the sections a a, and at its front end bearing against the mine. Other suitable means may be employed to support or attach the rear end of the base D to the support A; but we will not recite them here.

G designates a sliding table clasping the sides of the track or plate E, and arranged to 7 5 slide longitudinallyupon the same,a U shaped bracket, H, being secured to the said table and having a shaft, I, journaled in the sides thereof. A gear-wheel, J, is keyed on the said shaft within the bracket and meshes with a gearwheel, K, formed on the end of a revolving cylinder, L, mounted in an extension, M, of the bracket H.

N designates a screw threaded spindle formed square at each end, as at m, and provided with openings a, either end of the spindle being adapted to enter a square opening,

0, in the cylinder L, the opening a of the spindle registering with a passage, p, in the cylinder, a split key, 0, passing through the open 0 ing a and passage 1), and connecting the spindle det-achably to the cylinder. An internallyscrew-threaded box, P, is mounted upon the spindle, and is provided at each end with lugs g, which rest in slots or bearings 1' of uprights 5 attached to the sides of the base it). The handle R of the drill or anger Sis fitted to the end of the spindle in any suitable manner, and said drill or anger is likewise attached, so as to be readily separated at will. IOO

The operating-shaft I is provided at one end l of the auger being attached to the other end with a plate, S", having an outwardly-turned projection, 8, formed with recesses tin its sides, and the operating handle-or crank T is formed with a longitudinal slot, a, the sides of which fit within the recesses 15 and allow the sliding movement of the handle. A clamping-plate, U, fits around and clasps the lower end of the handle, a thumb-nut, WV, being screwed onto the extreme end of shaft I and bearing against the clamping-plate,to hold the handle or crank at'any desired point. It will be seen that by means of this construction the handle or crank may be adjusted to any desired length, and this will prove of great advantage in such cases where its ordinary length would interfere with the free operation of the same, or when it is desired to give a greater or less throw to the crank in order to insure a corresponding decrease or increase of power.

The operation of our inventionwill be readily understood from the foregoing description, taken in connection with the annexed drawings. The support A is adj usted in the coalmine, as shown, the drilling mechanism is placed upon the support, and the handle or crank is operated to turn or revolve the drill or anger against the mine. As the drill or anger is forced inward by the operation of the crank, the table G slides forward, the working of the spindle N through the box P permitting this forward movement of the table, and thereby causing the entire operating mechanism to slide forward with the drill or anger. "When the mechanism has reached its limit of movement, the key 0 is withdrawn, so asto discon' nect the spindle N and cylinder L, the sliding table and the mechanism connected thereto being moved back to its original position. Then lift the screw-threaded spindle and its box P out of its bearings and disconnect the handle of the drill or anger; and, finally; re verse the position of the spindle, the end to which the auger was formerly attached being now connected to the cylinder, and the handle of the spindle. sition to be operated anew, and the operation can be repeated as often as desired.

The machine is now in a po-- It will be seen that the sliding movement of the operating mechanism adds to the efficiency of the machine, and, besides, makes the work and labor considerably lighter. The reversible screw-threaded spindle adds an important feature to our machine, since, by means of whieh,the,repeated operation of the same is performed with ease and without unnecessary loss of time. The solid internally-screw-threaded box through which the spindle works permits of an equal wear on both sides of the screwthreads of the spindle and boX, and thus will last much longer and be more serviceable than an open box. It will also seen that the drill or anger spindle N will be held steady and in line with the drill by means of the sliding table and the other mechanism moving therewith.

It will be apparent that our drilling-machine may be used for stone-workingsuch as rockdrilling or similar purposes-and that various modifications may be resorted to without departing from the spirit or scope of our invention.

Having described our invention, we claim- In a drilling-machine, the combination ,with the adjustable support constructed substantially as described, of the base D, provided with an extension, F, to clasp or fit around the support, a track secured to the base, and a sliding table moving in said track and carrying the operating mechanism, as set forth.

In testimony that we claim the foregoing as our own we have hereto affixed our signatures in presence of two witnesses.

JOHN L. HARKNESS. I CHARLES B. SHAW.

Vitnesses:

H. O. TURNER, L. A. Soo'rr. 

